Thread:JayAaerow/@comment-6769189-20160603184312/@comment-967403-20160619225023

Ah! I see. I went back to look into it. It's not the official games that cover this. The Deadly Fortune Novel explained Sparda and Mundus's relationship. He was his righthand man and it was his contributions that enabled Mundus to takeover in the first place. But when he went to the human world, he ended up stopping him for some reason. The DF novel just says he did this with the "whim" of the moment or something. Who knows?

But that's where they explained that. Maybe the anime episodes involving Baul and Modeus may also have some info on his past. I don't know.